1, machine tool manufacturing error machine tool manufacturing error mainly includes spindle rotation error, guide rail error and transmission chain error. Spindle rotation error refers to the actual rotation axis of the spindle at each moment relative to its average axis of rotation, it will directly affect the precision of the workpiece. The main reasons for spindle rotation error are spindle coaxiality error, bearing error, coaxiality error between bearings, spindle winding and so on. The guide rail is the benchmark to determine the relative position of each machine tool component on the machine tool as well as the benchmark of machine tool movement. The manufacturing error, uneven wear and installation quality of the guide rail are the important factors causing the guide error. Transmission chain error refers to the relative motion error between the beginning and end of the transmission chain. It is caused by the manufacturing and assembly errors of the components of the transmission chain and the wear in the process of use

2, tool geometric error any tool in the cutting process is inevitable to produce wear, and the resulting size and shape of the workpiece to change. The influence of tool geometry error on machining error is different with different tool types. When machining with fixed size tool, the tool manufacturing error will directly affect the machining accuracy of workpiece. But for the general tool (such as turning tool, etc.), its manufacturing error has no direct influence on machining error